package com.sum.tea.adapter;

import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SimpleAdapter;

import java.util.List;
import java.util.Map;

/**
 * 自定义list 适配器
 * 
 * @author Administrator
 * 
 */
public class MyAdapter extends SimpleAdapter {
	public MyAdapter(Context context, List<? extends Map<String, ?>> data,
			int resource, String[] from, int[] to) {
		super(context, data, resource, from, to);
		// TODO Auto-generated constructor stub
		cr = Color.WHITE;
	}

	public void setColor(int color) {
		cr = color;
	}

	private int cr;

	@Override
	public View getView(final int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		// listview每次得到一个item，都要view去绘制，通过getView方法得到view
		// position为item的序号
		View view = null;
		if (convertView != null) {
			view = convertView;
			// 使用缓存的view,节约内存
			// 当listview的item过多时，拖动会遮住一部分item，被遮住的item的view就是convertView保存着。
			// 当滚动条回到之前被遮住的item时，直接使用convertView，而不必再去new view()
		} else {
			view = super.getView(position, convertView, parent);
		}
		int[] colors = { cr, Color.rgb(219, 238, 244) };// RGB颜色
		view.setBackgroundColor(colors[position % 2]);// 每隔item之间颜色不同
		// Log.d("MYINFO", "getview:"+String.valueOf(position));
		return super.getView(position, view, parent);
	}

	public void notifyDataSetChanged() {
		super.notifyDataSetChanged();
	}
}
